1/*********************************************************************** 2* 3* pppoe.h 4* 5* Declaration of various PPPoE constants 6* 7* Copyright (C) 2000 Roaring Penguin Software Inc. 8* 9* This program may be distributed according to the terms of the GNU 10* General Public License, version 2 or (at your option) any later version. 11* 12* $Id: pppoe.h,v 1.2 2004/11/04 10:07:37 paulus Exp $ 13* 14***********************************************************************/ 15 16#ifdef __sun__ 17#define __EXTENSIONS__ 18#endif 19 20#include "config.h" 21 22#if defined(HAVE_NETPACKET_PACKET_H) || defined(HAVE_LINUX_IF_PACKET_H) 23#define _POSIX_SOURCE 1 /* For sigaction defines */ 24#endif 25 26#include <stdio.h> /* For FILE */ 27#include <sys/types.h> /* For pid_t */ 28 29/* How do we access raw Ethernet devices? */ 30#undef USE_LINUX_PACKET 31#undef USE_BPF 32 33#if defined(HAVE_NETPACKET_PACKET_H) || defined(HAVE_LINUX_IF_PACKET_H) 34#define USE_LINUX_PACKET 1 35#elif defined(HAVE_SYS_DLPI_H) 36#define USE_DLPI 37#elif defined(HAVE_NET_BPF_H) 38#define USE_BPF 1 39#endif 40 41/* Sanity check */ 42#if !defined(USE_BPF) && !defined(USE_LINUX_PACKET) && !defined(USE_DLPI) 43#error Unknown method for accessing raw Ethernet frames 44#endif 45 46#ifdef HAVE_SYS_CDEFS_H 47#include <sys/cdefs.h> 48#endif 49 50#ifdef HAVE_SYS_SOCKET_H 51#include <sys/socket.h> 52#endif 53 54/* Ugly header files on some Linux boxes... */ 55#if defined(HAVE_LINUX_IF_H) 56#include <linux/if.h> 57#elif defined(HAVE_NET_IF_H) 58#include <net/if.h> 59#endif 60 61#ifdef HAVE_NET_IF_TYPES_H 62#include <net/if_types.h> 63#endif 64 65#ifdef HAVE_NET_IF_DL_H 66#include <net/if_dl.h> 67#endif 68 69/* I'm not sure why this is needed... I do not have OpenBSD */ 70#if defined(__OpenBSD__) 71#include <net/ppp_defs.h> 72#include <net/if_ppp.h> 73#endif 74 75#ifdef USE_BPF 76extern int bpfSize; 77struct PPPoEPacketStruct; 78void sessionDiscoveryPacket(struct PPPoEPacketStruct *packet); 79#define BPF_BUFFER_IS_EMPTY (bpfSize <= 0) 80#define BPF_BUFFER_HAS_DATA (bpfSize > 0) 81#define ethhdr ether_header 82#define h_dest ether_dhost 83#define h_source ether_shost 84#define h_proto ether_type 85#define ETH_DATA_LEN ETHERMTU 86#define ETH_ALEN ETHER_ADDR_LEN 87#else 88#undef USE_BPF 89#define BPF_BUFFER_IS_EMPTY 1 90#define BPF_BUFFER_HAS_DATA 0 91#endif 92 93#ifdef USE_DLPI 94#include <sys/ethernet.h> 95#define ethhdr ether_header 96#define ETH_DATA_LEN ETHERMTU 97#define ETH_ALEN ETHERADDRL 98#define h_dest ether_dhost.ether_addr_octet 99#define h_source ether_shost.ether_addr_octet 100#define h_proto ether_type 101 102/* cloned from dltest.h */ 103#define MAXDLBUF 8192 104#define MAXDLADDR 1024 105#define MAXWAIT 15 106#define OFFADDR(s, n) (u_char*)((char*)(s) + (int)(n)) 107#define CASERET(s) case s: return ("s") 108 109#endif 110 111/* Define various integer types -- assumes a char is 8 bits */ 112#if SIZEOF_UNSIGNED_SHORT == 2 113typedef unsigned short UINT16_t; 114#elif SIZEOF_UNSIGNED_INT == 2 115typedef unsigned int UINT16_t; 116#else 117#error Could not find a 16-bit integer type 118#endif 119 120#if SIZEOF_UNSIGNED_SHORT == 4 121typedef unsigned short UINT32_t; 122#elif SIZEOF_UNSIGNED_INT == 4 123typedef unsigned int UINT32_t; 124#elif SIZEOF_UNSIGNED_LONG == 4 125typedef unsigned long UINT32_t; 126#else 127#error Could not find a 16-bit integer type 128#endif 129 130#ifdef HAVE_LINUX_IF_ETHER_H 131#include <linux/if_ether.h> 132#endif 133 134#include <netinet/in.h> 135 136#ifdef HAVE_NETINET_IF_ETHER_H 137#include <sys/types.h> 138 139#ifdef HAVE_SYS_SOCKET_H 140#include <sys/socket.h> 141#endif 142#ifndef HAVE_SYS_DLPI_H 143#include <netinet/if_ether.h> 144#endif 145#endif 146 147 148 149/* Ethernet frame types according to RFC 2516 */ 150#define ETH_PPPOE_DISCOVERY 0x8863 151#define ETH_PPPOE_SESSION 0x8864 152 153/* But some brain-dead peers disobey the RFC, so frame types are variables */ 154extern UINT16_t Eth_PPPOE_Discovery; 155extern UINT16_t Eth_PPPOE_Session; 156 157/* PPPoE codes */ 158#define CODE_PADI 0x09 159#define CODE_PADO 0x07 160#define CODE_PADR 0x19 161#define CODE_PADS 0x65 162#define CODE_PADT 0xA7 163#define CODE_SESS 0x00 164 165/* PPPoE Tags */ 166#define TAG_END_OF_LIST 0x0000 167#define TAG_SERVICE_NAME 0x0101 168#define TAG_AC_NAME 0x0102 169#define TAG_HOST_UNIQ 0x0103 170#define TAG_AC_COOKIE 0x0104 171#define TAG_VENDOR_SPECIFIC 0x0105 172#define TAG_RELAY_SESSION_ID 0x0110 173#define TAG_SERVICE_NAME_ERROR 0x0201 174#define TAG_AC_SYSTEM_ERROR 0x0202 175#define TAG_GENERIC_ERROR 0x0203 176 177/* Discovery phase states */ 178#define STATE_SENT_PADI 0 179#define STATE_RECEIVED_PADO 1 180#define STATE_SENT_PADR 2 181#define STATE_SESSION 3 182#define STATE_TERMINATED 4 183 184/* How many PADI/PADS attempts? */ 185#define MAX_PADI_ATTEMPTS 3 186 187/* Initial timeout for PADO/PADS */ 188#define PADI_TIMEOUT 5 189 190/* States for scanning PPP frames */ 191#define STATE_WAITFOR_FRAME_ADDR 0 192#define STATE_DROP_PROTO 1 193#define STATE_BUILDING_PACKET 2 194 195/* Special PPP frame characters */ 196#define FRAME_ESC 0x7D 197#define FRAME_FLAG 0x7E 198#define FRAME_ADDR 0xFF 199#define FRAME_CTRL 0x03 200#define FRAME_ENC 0x20 201 202#define IPV4ALEN 4 203#define SMALLBUF 256 204 205/* A PPPoE Packet, including Ethernet headers */ 206typedef struct PPPoEPacketStruct { 207 struct ethhdr ethHdr; /* Ethernet header */ 208#ifdef PACK_BITFIELDS_REVERSED 209 unsigned int type:4; /* PPPoE Type (must be 1) */ 210 unsigned int ver:4; /* PPPoE Version (must be 1) */ 211#else 212 unsigned int ver:4; /* PPPoE Version (must be 1) */ 213 unsigned int type:4; /* PPPoE Type (must be 1) */ 214#endif 215 unsigned int code:8; /* PPPoE code */ 216 unsigned int session:16; /* PPPoE session */ 217 unsigned int length:16; /* Payload length */ 218 unsigned char payload[ETH_DATA_LEN]; /* A bit of room to spare */ 219} PPPoEPacket; 220 221/* Header size of a PPPoE packet */ 222#define PPPOE_OVERHEAD 6 /* type, code, session, length */ 223#define HDR_SIZE (sizeof(struct ethhdr) + PPPOE_OVERHEAD) 224#define MAX_PPPOE_PAYLOAD (ETH_DATA_LEN - PPPOE_OVERHEAD) 225#define MAX_PPPOE_MTU (MAX_PPPOE_PAYLOAD - 2) 226 227/* PPPoE Tag */ 228 229typedef struct PPPoETagStruct { 230 unsigned int type:16; /* tag type */ 231 unsigned int length:16; /* Length of payload */ 232 unsigned char payload[ETH_DATA_LEN]; /* A LOT of room to spare */ 233} PPPoETag; 234/* Header size of a PPPoE tag */ 235#define TAG_HDR_SIZE 4 236 237/* Chunk to read from stdin */ 238#define READ_CHUNK 4096 239 240/* Function passed to parsePacket */ 241typedef void ParseFunc(UINT16_t type, 242 UINT16_t len, 243 unsigned char *data, 244 void *extra); 245 246#define PPPINITFCS16 0xffff /* Initial FCS value */ 247 248/* Keep track of the state of a connection -- collect everything in 249 one spot */ 250 251typedef struct PPPoEConnectionStruct { 252 int discoveryState; /* Where we are in discovery */ 253 int discoverySocket; /* Raw socket for discovery frames */ 254 int sessionSocket; /* Raw socket for session frames */ 255 unsigned char myEth[ETH_ALEN]; /* My MAC address */ 256 unsigned char peerEth[ETH_ALEN]; /* Peer's MAC address */ 257 UINT16_t session; /* Session ID */ 258 char *ifName; /* Interface name */ 259 char *serviceName; /* Desired service name, if any */ 260 char *acName; /* Desired AC name, if any */ 261 int synchronous; /* Use synchronous PPP */ 262 int useHostUniq; /* Use Host-Uniq tag */ 263 int printACNames; /* Just print AC names */ 264 int skipDiscovery; /* Skip discovery */ 265 int noDiscoverySocket; /* Don't even open discovery socket */ 266 FILE *debugFile; /* Debug file for dumping packets */ 267 int numPADOs; /* Number of PADO packets received */ 268 PPPoETag cookie; /* We have to send this if we get it */ 269 PPPoETag relayId; /* Ditto */ 270} PPPoEConnection; 271 272/* Structure used to determine acceptable PADO or PADS packet */ 273struct PacketCriteria { 274 PPPoEConnection *conn; 275 int acNameOK; 276 int serviceNameOK; 277 int seenACName; 278 int seenServiceName; 279}; 280 281/* Function Prototypes */ 282UINT16_t etherType(PPPoEPacket *packet); 283int openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr); 284int sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size); 285int receivePacket(int sock, PPPoEPacket *pkt, int *size); 286void fatalSys(char const *str); 287void rp_fatal(char const *str); 288void printErr(char const *str); 289void sysErr(char const *str); 290void dumpPacket(FILE *fp, PPPoEPacket *packet, char const *dir); 291void dumpHex(FILE *fp, unsigned char const *buf, int len); 292int parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra); 293void parseLogErrs(UINT16_t typ, UINT16_t len, unsigned char *data, void *xtra); 294void syncReadFromPPP(PPPoEConnection *conn, PPPoEPacket *packet); 295void asyncReadFromPPP(PPPoEConnection *conn, PPPoEPacket *packet); 296void asyncReadFromEth(PPPoEConnection *conn, int sock, int clampMss); 297void syncReadFromEth(PPPoEConnection *conn, int sock, int clampMss); 298char *strDup(char const *str); 299void sendPADT(PPPoEConnection *conn, char const *msg); 300void sendSessionPacket(PPPoEConnection *conn, 301 PPPoEPacket *packet, int len); 302void initPPP(void); 303void clampMSS(PPPoEPacket *packet, char const *dir, int clampMss); 304UINT16_t computeTCPChecksum(unsigned char *ipHdr, unsigned char *tcpHdr); 305UINT16_t pppFCS16(UINT16_t fcs, unsigned char *cp, int len); 306void discovery(PPPoEConnection *conn); 307unsigned char *findTag(PPPoEPacket *packet, UINT16_t tagType, 308 PPPoETag *tag); 309 310#define SET_STRING(var, val) do { if (var) free(var); var = strDup(val); } while(0); 311 312#define CHECK_ROOM(cursor, start, len) \ 313do {\ 314 if (((cursor)-(start))+(len) > MAX_PPPOE_PAYLOAD) { \ 315 syslog(LOG_ERR, "Would create too-long packet"); \ 316 return; \ 317 } \ 318} while(0) 319 320/* True if Ethernet address is broadcast or multicast */ 321#define NOT_UNICAST(e) ((e[0] & 0x01) != 0) 322#define BROADCAST(e) ((e[0] & e[1] & e[2] & e[3] & e[4] & e[5]) == 0xFF) 323#define NOT_BROADCAST(e) ((e[0] & e[1] & e[2] & e[3] & e[4] & e[5]) != 0xFF) 324